package com.whpost.service.tools;

import java.security.MessageDigest;


/**
 *@Title Sha1.java
 *@description TODO
 *@time 2018年3月26日 下午3:46:10
 *@author juyi
 *@version 1.0
**/
public final class Sha1 {
    private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5','6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
    private static String getFormattedText(byte[] bytes) 
    {
        int len = bytes.length;
        StringBuilder buf = new StringBuilder(len * 2);
        // 把密文转换成十六进制的字符串形式
        for (int j = 0; j < len; j++) 
        {
            buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);
            buf.append(HEX_DIGITS[bytes[j] & 0x0f]);
        }
        return buf.toString();
    }
    public static String encode(String str) 
    {
        if (str == null) 
        {
            return null;
        }
        try 
        {
            MessageDigest messageDigest = MessageDigest.getInstance("SHA1");
            messageDigest.update(str.getBytes());
            return getFormattedText(messageDigest.digest());
        } 
        catch (Exception e) 
        {
        	ToolBean.info("sha1加密发生错误："+e);
            throw new RuntimeException(e);
        }
    }
    public static String s(String str) 
    {
        if (str == null) 
        {
            return null;
        }
        try 
        {
            MessageDigest messageDigest = MessageDigest.getInstance("SHA1");
            messageDigest.update(str.getBytes());
            return getFormattedText(messageDigest.digest());
        } 
        catch (Exception e) 
        {
            ToolBean.info("sha1加密发生错误："+e);
            throw new RuntimeException(e);
        }
    }
}
